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gh-98831: Finish the UNPACK_SEQUENCE family (#101666)

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New generator feature: Generate useful glue for output arrays, so you can just write values to the output array (no bounds checking). Rewrote UNPACK_SEQUENCE_TWO_TUPLE to use this, and also UNPACK_SEQUENCE_{TUPLE,LIST}.
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Guido van Rossum 2023-02-07 15:44:37 -08:00 • committed by GitHub
parent 753fc8a5d6
commit aacbdb0c65
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5 changed files with 72 additions and 63 deletions
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37
Python/bytecodes.c
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@ -876,6 +876,13 @@ dummy_func(
}
}
family(unpack_sequence, INLINE_CACHE_ENTRIES_UNPACK_SEQUENCE) = {
UNPACK_SEQUENCE,
UNPACK_SEQUENCE_TWO_TUPLE,
UNPACK_SEQUENCE_TUPLE,
UNPACK_SEQUENCE_LIST,
};
inst(UNPACK_SEQUENCE, (unused/1, seq -- unused[oparg])) {
#if ENABLE_SPECIALIZATION
_PyUnpackSequenceCache *cache = (_PyUnpackSequenceCache *)next_instr;
@ -894,43 +901,36 @@ dummy_func(
ERROR_IF(res == 0, error);
}
inst(UNPACK_SEQUENCE_TWO_TUPLE, (unused/1, seq -- v1, v0)) {
inst(UNPACK_SEQUENCE_TWO_TUPLE, (unused/1, seq -- values[oparg])) {
DEOPT_IF(!PyTuple_CheckExact(seq), UNPACK_SEQUENCE);
DEOPT_IF(PyTuple_GET_SIZE(seq) != 2, UNPACK_SEQUENCE);
assert(oparg == 2);
STAT_INC(UNPACK_SEQUENCE, hit);
v1 = Py_NewRef(PyTuple_GET_ITEM(seq, 1));
v0 = Py_NewRef(PyTuple_GET_ITEM(seq, 0));
values[0] = Py_NewRef(PyTuple_GET_ITEM(seq, 1));
values[1] = Py_NewRef(PyTuple_GET_ITEM(seq, 0));
Py_DECREF(seq);
}
// stack effect: (__0 -- __array[oparg])
inst(UNPACK_SEQUENCE_TUPLE) {
PyObject *seq = TOP();
inst(UNPACK_SEQUENCE_TUPLE, (unused/1, seq -- values[oparg])) {
DEOPT_IF(!PyTuple_CheckExact(seq), UNPACK_SEQUENCE);
DEOPT_IF(PyTuple_GET_SIZE(seq) != oparg, UNPACK_SEQUENCE);
STAT_INC(UNPACK_SEQUENCE, hit);
STACK_SHRINK(1);
PyObject **items = _PyTuple_ITEMS(seq);
while (oparg--) {
PUSH(Py_NewRef(items[oparg]));
for (int i = oparg; --i >= 0; ) {
*values++ = Py_NewRef(items[i]);
}
Py_DECREF(seq);
JUMPBY(INLINE_CACHE_ENTRIES_UNPACK_SEQUENCE);
}
// stack effect: (__0 -- __array[oparg])
inst(UNPACK_SEQUENCE_LIST) {
PyObject *seq = TOP();
inst(UNPACK_SEQUENCE_LIST, (unused/1, seq -- values[oparg])) {
DEOPT_IF(!PyList_CheckExact(seq), UNPACK_SEQUENCE);
DEOPT_IF(PyList_GET_SIZE(seq) != oparg, UNPACK_SEQUENCE);
STAT_INC(UNPACK_SEQUENCE, hit);
STACK_SHRINK(1);
PyObject **items = _PyList_ITEMS(seq);
while (oparg--) {
PUSH(Py_NewRef(items[oparg]));
for (int i = oparg; --i >= 0; ) {
*values++ = Py_NewRef(items[i]);
}
Py_DECREF(seq);
JUMPBY(INLINE_CACHE_ENTRIES_UNPACK_SEQUENCE);
}
inst(UNPACK_EX, (seq -- unused[oparg & 0xFF], unused, unused[oparg >> 8])) {
@ -3185,6 +3185,3 @@ family(call, INLINE_CACHE_ENTRIES_CALL) = {
CALL_NO_KW_METHOD_DESCRIPTOR_O, CALL_NO_KW_STR_1, CALL_NO_KW_TUPLE_1,
CALL_NO_KW_TYPE_1 };
family(store_fast) = { STORE_FAST, STORE_FAST__LOAD_FAST, STORE_FAST__STORE_FAST };
family(unpack_sequence, INLINE_CACHE_ENTRIES_UNPACK_SEQUENCE) = {
UNPACK_SEQUENCE, UNPACK_SEQUENCE_LIST,
UNPACK_SEQUENCE_TUPLE, UNPACK_SEQUENCE_TWO_TUPLE };